Erik Johnson TCBES Masters program University of Hawaii at Hilo Surface water metabolism potential of groundwater-fed near shore waters on the leeward.

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Presentation transcript:

Erik Johnson TCBES Masters program University of Hawaii at Hilo Surface water metabolism potential of groundwater-fed near shore waters on the leeward coast of the Island of Hawaii

Groundwater discharge Major source of freshwater to Leeward Hawaii Groundwater introduces nutrients –Nitrogen and phosphorus Nutrients stimulate productivity –algal blooms

Surface Water Metabolism (MET) MET= gross primary production (GPP) - respiration (RESP) GPP > RESP –Autotrophic –CO 2 sink GPP < RESP –Heterotrophic –CO 2 source

Hypotheses pMET higher within groundwater plumes –Groundwater introduces nutrients pMET higher in wet seasons –Higher nutrient concentrations

Study sites Kiholo Bay –Undeveloped Kaloko-Honokohau –Developed Well documented groundwater inputs

Sample collection 6 stations –3 in-plume, 3 out-plume –Monthly for 1 year Salinity at Kaloko-Honokohau Kaloko-Honokohau, Feb 12, 2011

Kaloko-Honokohau, Feb 2011

Mahalo! Acknowledgments: Tracy Wiegner Jason Adolf Matthew Church Judy Walker Rebecca Most EPSCOR III NSF PRISM